Perhaps you should try some spelling variations:
cam thuc » am thuc, nam thuc, cam thu
da hanh » dao hanh, da thanh, dan hanh
cua tre » cuu tre, cua triet, dua tren
hanh va » hang va, hanh vi
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
sach ty » sach tu, sach thu, xach tay
thuc da » thuc dan, thuc day, thuc dia
ve cam » ve cham, ve cac, va cam
cua te » cua tu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ty) OR (sach y)) nang xa hoi. hieu ve cam thuc da hanh va ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach y)) nang xa hoi. hieu ve cam thuc da hanh va ((cua tre) OR (cua te))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ty) OR (sach y)) nang xa hoi. hieu ve cam thuc da hanh va ((cua tre) or (cua te))*".